Rudiments of ancient architecture, containing an historical account of the five orders, with their proportions, and examples of each from antiques also, extracts from Vitruvius, Pliny, &c. relative to the buildings of the ancients
— London, 1810 (4. Aufl.)

The Eustyle manner is now to betreated^
of; which, with great justice, for its use-
fulness^ beauty, and durability, merits
every commendation. It is formed by al-
lowing to the distance of the intercolum-
niations two diameters and a quarter, and
to the middle intercolumniation only,both
before and behind, three diameters. Thus
the figure has a beautiful aspect, is acces-
sible without impediment; and round the
cell is a stately ambulatory.

The rule is this :

The front of the building if it is Tetras-
tyle (four columns), is divided into eleven
parts and a half, without reckoning the
projection of the base of the column. If
it is Hexastyle, (six columns), it is divided
into eighteen parts. If it is Octastyle
(eight columns), it is divided into twenty-
four parts and a half. Of these parts,
one, whether the building be tetrastyle,
hexastyle or octastyle, shall be a module,
which is to be the thickness of a column.
Each intercolumniation, except the middle
one, must be two modules and a quarter;
the middle one shall have three modules
both before and behind: the height of the
columns shall be eight modules and a half: